strange behavior with contacts

let's say you want to edit a contact. on my 600, bring up the phone app, type in a few letters, press the up arrow to select the name itself and hit the center button. easy.
but on the 680, sometimes i press the up arrow and then the treo automatically moves to the first number in this list for that contact. this only happens if do the sequence quickly. i suspect the contacts app is still looking for matches.
anybody else noticed this?